Handestine

Definition:n., An expressive gesture made with the belief that the person it is directed at cannot see it, typically occurs during telephone conversations, email discourses, and behind people's backs. v. To use an unseen gesture to express what you cannot say.

Pronunciation: han/dess/tine

Sentence: They thought the CEO couldn't see the one fingered handestine salute he was given behind his back. Little did they know he wore two way mirrored glasses.